Malicious PDF — malware analysis report

Static analysis result for SHA-256 607889546a5b1fb0…

MALICIOUS

PDF

53.5 KB Created: 2020-08-08 17:00:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65961223348b7987874d4fff5e744494 SHA-1: 4f964a61eee10101000afab57cf898eff070da87 SHA-256: 607889546a5b1fb05921d70b64ea99268536b0cc7299e475dc9fcc815013ae73
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to benign Shopify URLs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the same lure text and URLs, suggesting an attempt to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=5th+september+teachers+day+speech+in+bengali+pdf
    • http://files.sandpiperonsmithslake.com/uploads/1/3/1/4/131436956/5655211.pdf
    • http://files.vejudo.com/uploads/1/3/0/7/130739916/sokazovegumil-xonevejul-vetojavavug.pdf
    • http://fokeg.rachaelhudes.com/uploads/1/3/1/4/131407406/3773259.pdf
    • http://files.apparelfromhazy.com/uploads/1/3/1/4/131437333/1221815.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0438/6275/3445/files/pigumorujuvemasu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7909/0854/files/73914810183.pdf
    • https://cdn.shopify.com/s/files/1/0433/3672/8734/files/axis_direct_demo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7215/0942/files/mebolujatikijefe.pdf
    • https://cdn.shopify.com/s/files/1/0427/4136/6951/files/clicker_keypad_programming.pdf
    • https://cdn.shopify.com/s/files/1/0428/1883/0503/files/rigasopixojixakunuvir.pdf
    • https://cdn.shopify.com/s/files/1/0427/3415/7991/files/43729337446.pdf
    • https://cdn.shopify.com/s/files/1/0431/5381/7762/files/22675643000.pdf
    • https://cdn.shopify.com/s/files/1/0431/4441/3341/files/cardioversion_medicamentosa.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/39386536543.pdf
    • https://cdn.shopify.com/s/files/1/0434/4050/4999/files/allama_iqbal_open_university_books_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0434/8228/4194/files/87301110440.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008319.bin
1f210de91b71eb13a00193656a77947f92e1e66c51f854e349c144b94f398aef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8319 5520 bytes
font_01_sfnt_off000095b0.bin
cc8d36a64f679e23a991d06a24b2f21b4bef4cdd33d35d0ddd6a6ea4b8992067		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95B0 10908 bytes
font_02_sfnt_off0000bab4.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB4 4324 bytes

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